How to set the MTU in Windows XP?

Question Info

How can I change the MTU value in Windows registry.
Switches Boosts your business network with premium performance. This site in other languages x. When I plugged a phone in there was no dial tone. Guess what johnnyrev, Microsoft actually have a published tool to set this parameter, it's a simple click and run and you set the MTU for the adaptor to the desired size. Get answers and train to solve all your tech problems - anytime, anywhere.

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Tweaking DSL Speed (MTU Size) Setting in Windows XP

Click on Command Prompt. Follow the suggestion in the link Provided and check. Change the MTU setting: Thanks for marking this as the answer. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site. How satisfied are you with this response? Luckybean6 Replied on October 14, Singh Replied on October 14, In reply to Luckybean6's post on October 14, In reply to Ajit.

Singh's post on October 14, I never tried in Windows 8. Direct me to it. Notify Luckybean6 with your solution and your apologies. Experts Exchange Solution brought to you by. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform. Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care.

Ask your question anytime, anywhere, with no hassle. Go Premium Individual Business. Solutions Learn More Through Courses. If anywhere along the line a packet needed to be fragmented, the network actually sends an ICMP packet telling you that a fragmentation happened. Your machine gets this ICMP packet, is told what the largest size was, and is supposed to stop sending packets too big.

That's what causes web-server to not work. And the web-server's firewalls are misconfigured, blocking ICMP packets. So the web-server doesn't realize you never got the packet. I then added the following registry keys:.

I tried several values for the MTU entry rebooting each time. In both cases -- adding the first entry, then the second entry -- netsh still reported the MTU as Testing with ping confirmed or at least suggested that the MTU value configured in the registry was actually being used though. Also, when I first tried this on my machine, the Routing and Remote Access service was disabled, so I was unable to start it using your instructions. I changed "Startup type" from Disabled to Manual.

I then started the service from that dialog as well. If connecting to the internet through a router where the router is the PPPoE client as in my case , those instructions wouldn't be relevant, right? The instructions I followed, which led me to make the above changes to the registry, were in KB So i guess the answer to the original question is that on Windows XP you have to use trial-and-error with the Do not fragment flag to find the biggest packet you can send is.

Then you have your MTU. AdapterWatch displays useful information about your network adapters: The default MTU sizes for different network topologies.

You should not try to play with the MTU configuration in normal network setups. There is a VB code reference here. There is also a tool called DrTCP:. The Echo Request message cannot be fragmented by routers in the path to the destination.

Specifies the length, in bytes, of the Data field in the Echo Request messages sent. The default is The maximum size is 65, By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.

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